In plane switching liquid crystal displaying apparatus for improved luminance including a thin film transistor array substrate

• US 7,362,401 B2
• Filed: 01/04/2005
• Issued: 04/22/2008
• Est. Priority Date: 10/16/1997
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kobayashi, Kazuhiro, Nakashima, Ken, Niwano, Yasunori, Oodoi, Yuuzou, Masutani, Yuichi
• Primary Examiner(s): Ngo; Huyen
• Application Number:
  US11/028,059
• Publication Number:
  US 20050151914A1
• Time in Patent Office: 1,204 Days
• Field of Search: 349141-146, 349/38, 349/43, 349/110, 349/139
• US Class Current: 349/141
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer

Abstract

An In Plane Switching (IPS) liquid crystal displaying apparatus includes a TFT array substrate, an opposite substrate opposed to the TFT array substrate and a liquid crystal interposed between the TFT array substrate and the opposite substrate. The TFT array substrate includes a plurality of driving electrodes formed on a passivation film and connected with the plurality of TFTs, a plurality of opposite electrodes formed on the passivation film, each of the plurality of opposite electrodes opposing the respective plurality of driving electrodes, and a plurality of common lines configured to connect each of the plurality of opposite electrodes with each of a plurality of pixels. The TFT array substrate provided with a light shielding formed in such a manner as to superpose one signal line of the plurality of signal lines and one opposite electrode of the plurality of opposite electrodes.

Claims

1. An In Plane Switching (IPS) liquid crystal displaying apparatus, comprising:

a Thin Film Transistor (TFT) array substrate;

an opposite substrate opposed to said TFT array substrate; and

liquid crystal interposed between said TFT array substrate and said opposite substrate,

wherein said TFT array substrate comprises,

a glass substrate,

a gate insulating film formed on said glass substrate,

a passivation film formed on said gate insulating film,

a plurality of scanning lines configured to transmit a plurality of scanning signals and formed on said glass substrate,

a plurality of signal lines configured to transmit a plurality of image signals and formed on said gate insulating film,

a plurality of pixels arranged in a grid like pattern by crossing said plurality of scanning lines with said plurality of signal lines,

a plurality of TFTs implementing a switching operation of said plurality of image signals based on said plurality of scanning signals,

a plurality of driving electrodes formed on said passivation film and connected with said plurality of TFTs,

a plurality of opposite electrodes formed on said passivation film, each of said plurality of opposite electrodes opposing each of said plurality of driving electrodes, and

a plurality of common lines configured to connect each of said plurality of opposite electrodes with each of said plurality of pixels,

wherein said TFT array substrate is provided with a light shielding means formed in such a manner as to superpose one signal line of the plurality of signal lines and one opposite electrode of the plurality of opposite electrodes,

wherein said light shielding means is formed on a same layer as that of said plurality of scanning lines.

2. An In Plane Switching (IPS) liquid crystal displaying apparatus, comprising:

a Thin Film Transistor (TFT) array substrate;

an opposite substrate opposed to said TFT array substrate; and

liquid crystal interposed between said TFT array substrate and said opposite substrate,

wherein said TFT array substrate comprises,

a glass substrate,

a gate insulating film formed on said glass substrate,

a passivation film formed on said gate insulating film,

a plurality of scanning lines configured to transmit a plurality of scanning signals and formed on said glass substrate,

a plurality of signal lines configured to transmit a plurality of image signals and formed on said gate insulating film,

a plurality of pixels arranged in a grid like pattern by crossing said plurality of scanning lines with said plurality of signal lines,

a plurality of TFTs implementing a switching operation of said plurality of image signals based on said plurality of scanning signals,

a plurality of driving electrodes formed on said passivation film and connected with said plurality of TFTs,

a plurality of opposite electrodes formed on said passivation film, each of said plurality of opposite electrodes opposing each of said plurality of driving electrodes, and

a plurality of common lines configured to connect each of said plurality of opposite electrodes with each of said plurality of pixels,

wherein said TFT array substrate further comprises;

at least one TFT of said plurality of TFTs;

at least one opposite electrode of said plurality of opposite electrodes;

at least one driving electrode of said plurality of driving electrodes; and

at least one storage capacity increasing electrode,

wherein a drain electrode of a TFT is electrically connected to said at least one driving electrode of said plurality of driving electrodes, and is interposed between said at least one storage capacity increasing electrode and at least one of said plurality of opposite electrodes, and

wherein said at least one storage capacity increasing electrode is formed on a same layer as that of said plurality of scanning lines.